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    SubjectRe: 2.4.21-pre4: PDC ide driver problems with shared interrupts
    Benjamin Herrenschmidt wrote:

    >While I agree with you here, I don't think it's what's happening.
    > /* clear INTR & ERROR flags */
    > hwif->OUTB(dma_stat|6, hwif->dma_status);
    You have way to much faith in the hardware. Promise is especially known
    for not keeping to the spec. I wouldn't trust the interrupt bit to be
    valid unless a dma is actually active, i.e. that

    hwif->OUTB(hwif->INB(dma_base)|1, dma_base);

    has actually been written.

    I've actually had a manufacturer tell me that they don't worry about the
    spec, just making things work with Windows.


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